Oh, ok, First off, it would look exactly like a completed hub in KatAM, and Meta Knights sword has a meter that fills up so that someone can grab it when full, and the stage would randomly change to either Rainbow Route, Midnight Mansion, Cabbage Cavern, Mustard Mountain, Carrot Castle, Olive Ocean, Peppermint Palace, Radish Ruins, Candy Constellation, Dimension Mirror where Nightmare(I think?) becomes a stage hazard, and, very rarely, the power-up room where there is one of every item.
Each of the randomized stages (With the exception of Dimension Mirror and power-up room) would just be a scrolling stage with Kirby enemies as stage hazards. So, yeah. It still would make a great stage